Serum cytokine profile indicators after subcutaneous implantation of the decellularized esophagus matrix in rats

Abstract

Study of postimplantation immune response to decellularized matrices has great importance for assessing biocompatibility of tissue-engineered structures based on them, since inflammatory process and excessive production of inflammatory mediators lead to complications and implant rejection. The aim of this research: serum cytokine profile studying after subcutaneous implantation of decellularized esophagus matrix in rats. Experimental data were obtained on male Wistar rats aged 5-6 months (n=55). Rats were divided into 4 groups: two control groups, experimental and comparison group. Control group 1 consisted of conditionally healthy rats (n=10), control group 2 - shame-operated animals (incision in scapula without implantation, n=15). In experimental group (n=15), rats underwent subcutaneous implantation of decellularized esophagus fragments; in group 2 (n=15) - native esophagus fragments. Peripheral blood sampling and fragment explantation were performed on 7th, 14th and 21st experimental days. Serum samples were tested for IL1a, IL2, IL4, IL17A, TNFa, IFNy, GM-CSF content by ELISA. Explanted native esophagus and decellularized esophagus fragments were subjected to histological analysis. On 7th experimental day, significant increase in IL1 a content was observed in rats with implantation of decellularized esophagus fragments. IL17A, IFNy, GM-CSF content significantly decreased. On 14th day, IL17A concentration sharply decreased in comparison with value on 7th experimental day and control 1. IL1 a and IFNy concentration decreased in comparison with control group 1 values and 7th day respectively. On 21st day, dynamics of decrease in IL17A, IFNy, IL1 a content in this rat group was revealed. Thus, it was found change in concentrations of studied cytokines corresponds to regeneration histomorphological picture in group that underwent implantation of acellular matrices against of active inflammatory reaction in comparison group. Concentrations of IL1 a, IL4, IL17A, IFNy reflect positive dynamics of wound healing process and absence of decellularized matrix rejection.